Possible Clues:

• All you can carry
• Tailor-made with no tie - is that as much as one can handle?
• Two bags of groceries, say
• Laundry unit
• Carrying capacity
• Quite a bit to carry
• As much as can be carried
• Big bag of groceries, e.g.
• As much as you can hold
• Milk, oddly in a way, is as much as one can bear